Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Internal.io - Build internal tools fast. Connect your databases, business apps, and REST APIs. Build any tool without engineering effort and free up valuable engineering time.
AppSheet - AppSheet enables users to create mobile apps instantly for both OS and Android.
Retool - Build custom internal tools in minutes.
Ninox - Ninox is a human-friendly database. Create your own Business Application with Ninox that matches your workflow. Ninox lets you integrate CRM, ERP, HR and many more...
Decisions - Decisions offers tools to define workflow automation and business rules.